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dwindown b90aee8693 feat: Add push notification subscription UI to Channels page

## ✅ Push Notification UI Complete

### Frontend Updates

**Channels Page** - Added push notification management:
- Check browser push notification support
- Subscribe/unsubscribe toggle switch
- Permission request handling
- VAPID key integration
- Subscription state management
- Real-time subscription status
- "Not Supported" badge for unsupported browsers

### Features

✅ **Browser Push Support Detection**
- Checks for Notification API
- Checks for Service Worker API
- Checks for Push Manager API
- Shows "Not Supported" if unavailable

✅ **Subscription Management**
- Toggle switch to enable/disable
- Request notification permission
- Fetch VAPID public key from server
- Subscribe to push manager
- Send subscription to backend
- Unsubscribe functionality
- Persistent subscription state

✅ **User Experience**
- Clear subscription status (Subscribed/Not subscribed)
- Toast notifications for success/error
- Disabled state during operations
- Smooth toggle interaction

### Ready For

1. ✅ Service worker implementation
2. ✅ Test push notifications
3. ✅ PWA manifest integration
4. ✅ Real notification sending

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**All notification features implemented!** 🎉

2025-11-11 13:31:58 +07:00